A typical mining riser board consists of an x1 plug board ... sometimes included with such miner kits – all those “SATA power to PCIe 6-pin” have a serious mismatch between input and output ...
The Fujitsu Futro S900 was built up to 2013, and only had one SATA port from the factory. [Jan] wanted to add another as this would make the device more useful as a network attached storage server.